public class Homework04 {

	public static void main(String[] args) {
	
	//将String转换成double类型的语句，
	//以及将char类型转换成String的语句
		String str = "10.0";
		double num1 = Double.parseDouble(str);
		char c1 = 'a';
		String str1 = c1 + "";
	}
}